mhi: cntrl: qcom: Update the fw image name for new devices

Newer devices need to load xbl.elf over BHI instead of the older
filename sbl1.mbn. Make the appropriate filename change in the
firmware info table.

Change-Id: If5a455469c38a9134f610bcd39e5028cc9dbb6b4
Signed-off-by: Bhaumik Bhatt <bbhatt@codeaurora.org>